US3033CS UNISEM, US3033CS Datasheet
US3033CS
Manufacturer Part Number
US3033CS
Description
Manufacturer
UNISEM
Datasheet
1.US3033CS.pdf
(9 pages)
Specifications of US3033CS
Case
SOP-8
Date_code
98+/SZ
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Part Number:
US3033CS
Manufacturer:
UNISEM
Quantity:
588
Part Number:
US3033CS
Manufacturer:
UNISEM
Quantity:
20 000
FEATURES
APPLICATIONS
TYPICAL APPLICATION
Notes: P54C,P55C,Pentium II are trade marks of Intel Corp. K5 & K6 are trade marks of AMD corp. Cyrix 6X86L,M1,M2 are trade marks
of Cyrix Corp. Power PC is trade mark of IBM Corp.
PACKAGE ORDER INFORMATION
FEATURES
APPLICATIONS
TYPICAL APPLICATION
PACKAGE ORDER INFORMATION
Rev. 1.5
1/14/99
LDO Controller allows the use of a low cost
pass transistor for the I/O supply
8 pin SOIC combines switching and linear
controller
Internal Pre-regulator Eliminates Cross talk
between Switching & Linear regulators
Automatic shut down of the linear regulator
when connected to the Vcc2 Det pin
On board MOSFET driver
Fastest transient response of any controller
method. ( 0 to 100% Duty Cycle in 100 nS )
1% internal voltage reference
Internal Under Voltage Lockout protects
MOSFET during start-up
Dual supply low voltage processor applications,
such as: P55C ,CYRIX M2 , POWER PC and
AMD K6
Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium II applications
Typical application of US3033 in a flexible mother board designed for Intel P55 ,P54
12V
5V
AMD K5,K6 as well as Cyrix M1 and M2 applications.
R9
L1
C1
C8
C2
C3
Drv1V12swVfb1 Vhyst
V12
Q2
8
1 2 3 4
US3033
Drv2
Q1
7
Vfb2
6
D1
R10
Gnd
5
0 TO 70
TA (°C)
R3
C5
D2
DESCRIPTION
DESCRIPTION
The US3033 IC combines a switching controller and
a linear regulator controller all in a compact 8 pin
surface mount package, providing a total solution for
dual supply processor applications such as an Intel
P55C
the M2 processors. Typically in these applications a
dual supply regulator converts 5V to 3.3V for I/O supply
and a jumper programmable supply of 1.25V to 3.5V for
CORE supply .The linear regulator controller portion in
the US3033 is a programmable controller allowing flex-
ibility for the I/O regulator and has a minimum of 50mA
drive current capability designed to provide ample cur-
rent for an external pass transistor. The IC uses an inter-
nal regulator generated from the 12V supply to power
the controller as well as the 12V supply to drive the power
MOSFET, allowing a low cost N channel MOSFET
switch to be used. The IC also includes an error com-
parator for fast transient response, a precise voltage ref-
erence for setting the output voltage as well as a direct
drive of the MOSFET for the minimum part count.
L2
8 PIN PLASTIC
US3033CS
R6
R7
SOIC (S)
PWM SWITCHER & LINEAR
, AMD K6 , as well as Cyrix 6X86L
R4
R5
C6
R8
C7
5V
I / O
Vcc2 Det
Core
3033app1-1.1
CPU
CONTROLLER IC
US3033
4-1
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